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Review & Installation Video

Hey everybody. I'm Justin with AmericanMuscle.com and this is my detailed overview of the Eibach Sport-Plus Suspension Kit, available for your 2015 or newer Mustang GT. The Sport-Plus Suspension Kit here is a great choice for any S550 GT owner out there looking to a trusted name like Eibach to help lower their ride, while greatly improving the handling at the same time, using a couple of different components.
The components I'm talking about here with this kit include a brand new set of front and rear adjustable sway bars, along with Eibach's very popular Sportline Lowering Springs which are going to offer a very aggressive drop for your coup or convertible.
Now if you're really set on a name like Eibach and you like the idea of a matched kit like this, but maybe you prefer a slightly milder drop, then you definitely want to check out Eibach's Pro-Plus Kit instead. Again, it will offer a slightly smaller drop thanks to those Pro-Kit springs from Eibach.
But for now let's dive a little deeper into the Sport-Plus system. The Sport-Plus Kit does start off with the Sportline Lowering Springs here from Eibach. Again, a very, very popular aftermarket spring; not just with the S550 cars but also the previous generation Mustangs as well, and that's because they're going to offer one of the biggest drops in the category. And that is certainly true here again, guys, with the 2015 or newer Mustangs because these things are going to drop the front of the car roughly an inch and a half, and just a little bit less in the rear. At the time of this video, this is the biggest drop you can get with a set of aftermarket lowering springs here at AmericanMuscle.com. So if you're really into that low look these are going to be a great option.
Sportlines do feature a progressive or dual rate spring here, and that's always a great choice for a street car because they're going to be relatively comfortable when cruising. Granted, a little firmer than your stock springs, but then they tend to progressively get firmer the harder the car is pushed. And that is certainly reflected in the spring rates; the initial spring rate for the Sportlines include a 217-pound front and an 870-pound rear spring, with a secondary spring rate of a 331-pound front and 994-pound rear. So again guys, you can see they get progressively firmer the more these springs are compressed.
Now some of the benefits of going with a progressive spring like this is improved roll control and corners; more so than a traditional linear spring, for instance, and even greater when paired with a matched set of sway bars like this kit from Eibach, and I will break these sway bars down here in a minute. Along with that improved roll control, or less body roll overall, you will also see other improvements in regards to your weight transfer; basically front to back, back to front, so less nosedive under hard breaking and less squatting under hard acceleration.
And lastly, one of the biggest benefits with the Sportlines, the appearance. Now these are definitely going to appeal to those S550 owners out there who enjoy more of a slammed look with a lot of rate because, again, these will lower the car a little bit more up front. This is one of those times, guys, where I'm going to ask you to check out the product page at AmericanMuscle.com if you haven't done so already, because we have a ton of customer-submitted images with owners of the Sportline Springs and their S550, and it's really going to give you a better idea of what to expect with your own ride.
Again guys, I do want to remind you that if you're not a huge fan of that slammed look and maybe you're just worried about speed bumps or going into your driveway and you want to stick with a name like Eibach, then please check out their Pro-Plus Kit because, again, it does feature a slightly smaller drop thanks to the Pro-Kit spring, which is definitely a great spring in itself. It's only going to lower your car roughly an inch, as opposed to the bigger drop of the Sportline, and it does have the benefit of a slightly lower price tag as well.
But again, the springs are really only one half of the equation here with the Sport-Plus Kit. Eibach does match the Sportline springs with their front and rear, three-way adjustable sway bars, which again are going to be a huge improvement over the factory bars in your S550. As far as diameters go, guys, you're looking at a beefy 35-millimeter tubular front matched by a 25-millimeter tubular rear bar here, again from Eibach. Tubular construction is nice because it will save some weight over those heavy solid bars without compromising any rigidity.
By upgrading both the front and rear sway bar, the car should feel just more responsive overall. It's going to feel a little flatter in turns thanks to the drastically reduced body roll, and ultimately the bar should help the car rotate through turns much better than before. Now this is a welcome change because anybody who's driven these things hard knows that from the factory these cars tend to have a little under-steering characteristic, basically meaning the car wants to push or plow through turns.
Again with the bigger bars you're just going to experience more of a neutral balance with the car, maybe even the slightest bit of over-steer, depending on how you set these bars up. And again, when paired with the springs, the car is just going to feel like a completely different animal on the street and when pushed hard in turns.
Now, with that said, you do have some adjustability to play with here with the Eibach bars as they're both three-way adjustable. Essentially, this is just going to allow you to soften or stiffen the bars depending on how you want your car to feel. Everybody has their own preferences, so you might have to play with the settings a little bit before you land on your ideal setup.
Now when getting these things installed, I'd personally recommend just starting with both end links in the middle holes here and just going from there, because you need a starting point. If you did want to stiffen the bar, just move the end link one hole closer to the meat of the actual sway bar. That's going to essentially shorten the bar itself, stiffening it in the process. If you move the end link back, all the way to the far hole here, that's going to basically elongate or lengthen the bar, and that's going to loosen the sway bar in the process.
As far as construction, the Eibach bars are made in the USA from cold formed, high strength, aircraft grade steel and then finished off in a red powder coat just to help prevent any corrosion over the years. Now this kit does not include adjustable end links, but it's certainly not a bad idea to pick a set up. Especially because you're going to be dealing with a very low ride height with the Sportline springs. However, on the flip side, they do throw in brand new polyurethane bushings and brackets, which is a nice little touch.
When it comes down to price the Eibach Sport-Plus kit will set you back just south of $700 which isn't too bad when you consider what you're getting here. Now could you piece together a similar setup for less dough? Probably, but you have to keep in mind the Eibach stuff is completely top-notch in the world of suspension and this kit is designed to work together in harmony. Now you take a few different components from different brands, piece them together, and your results might vary. So ultimately, guys, Eibach has taken all of the guesswork out of this kit for you.
When it does come time for the install, guys, it's really not all that bad. Now sure, there's a lot of steps involved. But it's all very straightforward and can be accomplished with some very basic hand tools, including an assortment of wrenches and sockets, and of course don't forget your spring compressor as it will be needed with this install.
I am willing to give this one a 'two out of three' wrenches in my overall scale of difficulty. Again guys, it's not exactly hard; it's just going to be time consuming. So leave yourself at least a half a day in the shop or garage to get this one knocked out. You can do this one on jacks and jack stands if you like. A lift will always make life a lot easier. And again, when you mess with this much of your car's suspension, just make sure to have your alignment checked out afterwards.
Wrapping this one up here guys, the Sport-Plus Kit from Eibach really will offer a lot of bang for your buck. The improvement and handling and all around performance should be night and day compared to the factory parts they're replacing. And if you're a big fan of that low ride height, well, the Sportlines will definitely deliver there.
So that's my review of the Sport-Plus Kit from Eibach which you can grab right here at AmericanMuscle.com.

Improves Handling. Improve the handling of your S550 Mustang by upgrading to an Eibach Sport-Plus suspension kit. This kit is engineered to lower your S550 Mustang's center of gravity as well as reduce body roll which results in reduced squat during acceleration, superior handling, flatter cornering and better stability in any aggressive driving situation.

Improves Appearance. Not only does this Eibach Sport-Plus Suspension Kit improve the handling of your S550 Mustang, but it also improves it's over all appearance by lowering the ride height to get rid of that lifted 4x4 look that they roll out of the factory with for a more aggressive stance.

Eibach Sway Bars. Eibach manufactures their Anti-Roll Bars from cold-formed, high-strength aircraft-grade steel for precision performance. Both the 35mm tubular Front Sway Bar and 25mm Rear Sway Bar are 3-way adjustability which allows you to fine tune the handling of your S550 Pony to suite your personal driving needs - from mild to wild. Both are completed in a red powdercoat finish for great looks and long life.

Application. This Eibach Sport-Plus Suspension Kit is specifically designed for use on all 2015-2018 GT Mustangs that is not equipped with the MagneRide Suspension.

I have a 2017 GT convertible ordered. Three questions: will these fit a convertible, will they void the factory warranty, and will I need anything else besides a realignment after installation?

NickG

This suspension kit will work with a 2017 GT convertible. I suggest checking with your Ford Dealer to see if this kit would have any affect on the warranty. This kit comes with everything you'll need for a proper installation. You will not need to buy any extra parts.

Are the Eibach springs and sway bars red (like the red of Brembo calipers), or orange?
I am building my ‘15 GT ‘vert as a show car and I am interested in the Eibach Sportline lowering kit, mainly because I am very familiar with Eibach products over many years with good results, but also I want the suspension parts to be red like my Brembo calipers. Thanks.

StacyH

I have the stock performance pack alloys will these fit with 25mm spacers ?
Would like too avoid any rubbing

RichardH

The Eibach Sport-Plus Suspension Kit will fit without spacers. We have not tried to install this kit with stock wheels using large spacers to be able to confirm if this would work with your spacers.

The suspension parts are good quality and work well on my 2015 Mustang GT. The only issue I had is that the description stated it would lower the vehicle 1". It actually lowered the vehicle more than 1.5", which made it difficult to align.

The drop looks awesome and for the price for the sway bars as well was worth it. My mustang center of gravity was dropped and the body roll is very minimal and my mustang feels like a different car all together take corners like no other.

The kit definitely helps the car's handling and lower the center of gravity. If you are using 20" rims be sure to get the correct offset as this kit could make it difficult for the tires to wear properly and stay inside the wheel well.

The eibach sway bars Sportline Springs Or Pro Plus Springs will give you a drastic improvement during cornering. So drastic... You're definitely going to need a wider size tire and wheel. I'm running 20 x 10 20 x 11 with Nitto 555 G2 305's front and rear, They work extremely well and have a treadwear rating of 320!
It gives you the ultimate grip around corners and will make you think about not switching out 2 coilovers as of yet.

Install was not too bad. I would highly recommend you install the sway bars while doing a spring install. It makes it alot easier to remove the stock din away bar and reinstall the aftermarket sway bar when the STRUT IS OFF. The car handles like a beast.

Could not be happier with this product! Eibach did a bang up job with this kit. The suspension drop adds a mean aggressive look that makes the car a real head-turner. The sway bars and lack of body roll from the stiffer springs keep the car more level throughout the turns and keep the car planted. Banging through the gears is quicker and feels much smoother without the lean front to back every shift. The ability to tune the sway bar is a nice perk but I have kept it on the neutral setting. Make sure you watch an install video on this one. Being a first time tuner, this install was easy with the right tools and the install video. Install took 6 hours with 2 people.

I Watched video for install first to see wat i was getting into. Took me about 4-5 hours in the driveway w/ jacks and stands. Pretty basic bolt ons. Ride is stiffer but not uncomfortable. Swaybars are adjustable. Since my car is a daily driver i used the middle setting. Feels great in the corners, much tighter cornering now!

Eibach Sport-Plus Suspension Kit (15-18 GT w/o MagneRide)

Really awesome sway bars and Springs...
However, I would strongly suggest that you get aftermarket wheels and tires so that you can keep up with their grip around corners. On the medium setting of stiffness on your sway bars is so good and so drastic compared to the stock ones. You&#39;re going to need wider tires in the rear to keep up. But it plants your car and it feels extremely confidence expiring when cornering!

Word on The Street

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